ROLLBACK TO SAVEPOINT

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ROLLBACK TO SAVEPOINT

Rolls back the current transaction to a savepoint.

Synopsis

ROLLBACK [WORK | TRANSACTION] TO [SAVEPOINT] savepoint_name

Description

This command will roll back all commands that were executed after the
savepoint was established. The savepoint remains valid and can be rolled
back to again later, if needed.

ROLLBACK TO SAVEPOINT implicitly destroys all savepoints
that were established after the named savepoint.

Parameters

WORK

TRANSACTION

Optional key words. They have no effect.

savepoint_name

The name of a savepoint to roll back to.

Notes

Use RELEASE SAVEPOINT to destroy a savepoint without
discarding the effects of commands executed after it was established.

Specifying a savepoint name that has not been established is an error.

Cursors have somewhat non-transactional behavior with respect to savepoints.
Any cursor that is opened inside a savepoint will be closed when the
savepoint is rolled back. If a previously opened cursor is affected by
a FETCH command inside a savepoint that is later rolled
back, the cursor position remains at the position that FETCH
left it pointing to (that is, FETCH is not rolled back).
Closing a cursor is not undone by rolling back, either. A cursor whose
execution causes a transaction to abort is put in a can't-execute state,
so while the transaction can be restored using ROLLBACK TO SAVEPOINT,
the cursor can no longer be used.

Examples

To undo the effects of the commands executed after my_savepoint was
established:

Compatibility

The SQL standard specifies that the key word SAVEPOINT
is mandatory, but Greenplum Database (and Oracle) allow it to be omitted.
SQL allows only WORK, not TRANSACTION,
as a noise word after ROLLBACK. Also, SQL has an optional
clause AND [NO] CHAIN which is not currently supported
by Greenplum Database. Otherwise, this command conforms to the SQL standard.